CoralUp incorporates the same patented dual method approach to calcium supplementation as PurpleUp, but with a trace element composition specifically engineered for skeletal coral growth.CoralUp is not simply ionic calcium with trace elements thrown in, CoralUp contains real aragonite, what corals are actually made of. CoralUp is non-nutritive, no sugars, and no EDTA's which contribute to algae growth and unwanted bacterial blooms.CoralUp is easy to use, one bottle replaces the typical multi-product recipe favored by advanced hobbyists for successful coral skeletal growth.Unlike other calcium supplements, CoralUp contains naturally occurring carbonate that contributes to the pH support of reef systems.CoralUp contains an additional boost of iodine, strontium, and magnesium, those trace elements that become quickly depleted in heavily stocked reef systems.So packed with calcium, you can see it! Each capful contains over 170,000 ppm calcium, but in a form that allows you to add nearly three times the calcium of other brands without overdosing!